Properties of the Number 53557

Fifty-Three Thousand Five Hundred Fifty-Seven

Basics

Value: 53556 → 53557 → 53558

Parity: odd

Prime: No

Previous Prime: 53551

Next Prime: 53569

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 7 ² × 1093

Divisors: 1, 7, 49, 1093, 7651, 53557

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101000100110101

Octal: 150465

Duodecimal: 26BB1

Hexadecimal: d135

Square: 2868352249

Square Root: 231.42385356743154

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Composite numbers for which A324644(n)/A324198(n) = 2 and σ(n) == 2 (mod 4). A371082

Numbers m such that m² divides 2^k - 1 for some k, 0 < k <= m. A246503

E.g.f.: 1/sqrt(1+x² - 2·x*cosh(x)). A205570

Numerator of ∑_k=0..n (-1)^k/k!. A53557

a(1) = 1; for n > 1, a(n) is the smallest unused positive number such that sopfr(|a(n) - a(n-1)|) = sopfr(a(n) + a(n-1)) and ω(|a(n) - a(n-1)|) = ω(a(n) + a(n-1)), where sopfr(k) is the sum of the primes dividing k, with repetition. A370503